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Refined distance estimation of XMMU J174716.1-281048

ATEL # 1207; M. Del Santo (INAF/IASF-Roma), J. Chenevez (DNSC, Technical University of Denmark), S. Brandt (DNSC, Technical University of Denmark), A. Bazzano (INAF/IASF-Roma), P. Ubertini (INAF/IASF-Roma)
on 5 Sep 2007; 14:10 UT
Password Certification: Melania Del Santo (

Subjects: X-ray, Binaries, Neutron Stars, Transients

Further INTEGRAL analysis of the radius expansion X-ray burst from the Very Faint X-ray Transient (VFXT) XMMU J174716.1-281048 (ATel #970, #972, #1078, Del Santo et al., 2007, A&A, 468, L17) results on an average (80 s) unabsorbed bolometric flux of about 3x10-8 erg/cm2/s and a bolometric peak flux of 5x10-8 erg/cm2/s (errors < 20%). The latter provides an higher value for the distance estimation if compared with the one reported in Del Santo et al. 2007. In fact, using the empirically determined Eddington luminosity for radius expansion bursts (Kuulkers et al. 2003, A&A, 399, 663) we derive for XMMU J174716.1-281048 a distance of about 8 kpc, supporting the source being within the Galactic Centre region. The other findings of the paper Del Santo et al. 2007 on the quasi-persistent activity of this transient remain unchanged and are not influenced by the new distance estimation.

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